Method of producing acid and fire proof bodies.



"To all whom it may concern:

obtained by the decomposition of this sili- -cording to the equation ,perature to drive oil eitherthe s'ilicofiuorid taneously driven ofi,

PATENT ora ion ISRAEL SCHLOSSIBERG, 0F CHARLQTTENBUR G, GERMANY.

METHOD'OF PRODUCING ACID AND FIRE PROOF BODIES.

No Drawing. Application filed April 23,

Specification of Letters 'Patent.

1909. Serial No. 1,725.

. Be it known thatv I, ISRAEL SoH ossBERe, a subject of the Emperor of Russia, residing at Gharlottenburg, Berlin, in the Empire of Germany, have invented a new and useful Method of Producing Acid and Fire Proof Bodies, of which the following is a specification.

My invention relates to a method of producing acidand fire-proof bodies which consist of pure silicic acidcanhydrid. The method is characterized in that natural or artificial masses consisting of silicic acid soaked in a known manner with solutions of water-glass are conveniently formed, then impregnated with a suflicient quantity of silicofluoric acid, and thereupon burned untiLthe formed silicofluorid of sodium or the fluorid of silicon and the fluorid of sodium cofluorid of sodium are driven off. -When the masses of silica, for example quartz or sand, having been soaked with solutions of waterrglass and formed into bodies, arenow impregnated with a suficient quantity of silicofluoric acid, the latter will act upon the silicates in the manner, as is known, that acv Na SiFl +4cSiO +H O pure silicic acid anhyrid and silicofluorid ofsodium are formed. It the mass is now heated, it is possible according to the temof sodium as such, or if at. a higher temperature it is decomposed, to drive 0E first the volatile fluorid of silicon, and after an increase of the temperature also the fluorid of sodium, so that the product left behind, for exam le a stone, a vessel, or the like, consists 0 pure silicic acid anhydrid.

The driven-01f fluorid of silicon is colleeted iii water in asuitable condenser, where it turns into silicofiuoric acid while silicic acid is separated. This silicofluoric acid can be again used over in the said method.

The fluorid of sodium can be employed as such, or in case no importance is attached to the separation of the fluorid of silicon and of the fluorid of sodium, the impreg nated bodies are at once heated up to such a temperature, at which both the fluorid of v silicon and the fluorid of sodium are simulso that silicofiuorid of sodium is obtained as a icy-product.

r sand) with alkali The method'described can be'modified in that instead of the solutions of potassium or sodium water-glass dry alkali silicates are employed, and that the mixture formed from them and the silicic acid anhydrid is soaked with water and the soaked mass is formed into bodies, after which the bodies are treated as before. The result is the same, the only difference in the process be-' ing in the time when the water is added to the alkali silicates. In the first method, the water is added to the alkali silicates (producing a solution of water-glass) before they are added to the otheringredients, whereas in the second method, dry alkali silicates are used and the mixture afterward soaked with water.

I claim:

1, The herein described method of producing acidand fire-proof bodies of pure silicic acid anhydrid, which consists in soaking masses of silicic acid (silica, quartz, sand) with solutions of water-glass, forming bodies therefrom, impregnating these bodies with silicofluoric acid, and burning the bodies until the silicofluorid of sodium is driven off.

2. The herein described method of producing acidand'fire-proof bodies of pure silicic acid anhydrid, which consists in soaking masses of silicic acid (silica, quartz, sand) with solutions of water-glass, forming bodies therefrom, impregnating these bodies with silicofluoric acid, heating the bodies up to such a temperature that only the fluorid of silicon formed from the silico- V fluorid of sodium then produced is driven off and can be collected in water for turning into silicofluoric acid which can be used over again, whereupon the temperature is so much increased as to drive ofi also the fluorid of sodium formed.

3. The herein described method of producing acid and fire-proof bodies of pure silicic acid anhydrid, which consists in mixing masses of silicic acid (silica, quartz, silicates, soaking the mixture with. water, the soaked mixture, impregnating these bodies with silicofluoric acid, and burning the bodies until the silicofluorid of sodium is driven ofi. A

4. The herein described method of producing acid? and fire-proof bodies ofpure silicic acid anhydrid, which consists in mixg masses of s1l1c1c acid (silica, quartz,

forming bodies from Patented June ML, 1914).,

sand) with alkali silicates, soaking the mixture' with water, forming bodies from the soaked mixture, impregnating these bodies withsilicofluoric acld, heating the bodies up Y be collected in water for turning into silicofluoric acid which can be-used over'again,

whereupon the temperature is so much in- 10 creased as to drive off also the fiuorid of sodium formed. i

ISRAEL SOHLOSSBERG.

-Witnesses: I

HENRY HASPER, ARTHUR Somzonnmg. 

